mikem42:
What type of stone do you recommend using with this aeration system?http://www.northernbrewer.com/shop/aeration-system.html

theDarkSide:
I believe that setup comes with a 2 micron stone, which is the same one I have on my Williams setup: http://www.williamsbrewing.com/WILLIAMS-OXYGEN-AERATION-SYSTEM-P699.aspx

mikem42:
Thanks. I tried a 0.5 micron stone last time I brewed and didn't see any bubbles. I'll go ahead and use a 2 micron stone.

In The Sand:
I use the inline oxygenation setup from morebeer. It comes with a 2-micron. I use a 0.5-micron for carbonation. I like both. The 0.5 micron is going to have very very tiny bubbles so you may have to crank the O2 up to get results.